Keeper.sh
Sync events across Google Calendar, Outlook, iCloud and Fastmail
Visit keeper.sh ↗What is Keeper.sh?
Keeper.sh is an open-source calendar synchronization tool that copies events between multiple calendar services so all accounts show the same busy times. It supports Google Calendar, Outlook, iCloud, Fastmail, and CalDAV servers, with privacy controls to hide event titles, descriptions and locations during sync. The tool also functions as an MCP server and REST API, allowing AI agents to view and manage calendars from a unified interface.
Designed for anyone juggling multiple calendar accounts across personal, work and school, Keeper.sh prevents double-booking by keeping time slots aligned. The hosted version updates within seconds on Google and Outlook, while self-hosting includes all Pro features at no monthly cost. The project is built with Claude and available under AGPL-3.0 for anyone to inspect or run on their own server.
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vibetrend discovered Keeper.sh automatically. Evidence: GitHub ridafkih/keeper.sh; repo has .claude. View source.
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